Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6f3bd9e3ea9b5e0176a2bfeb04e97da8380b94c6ba918482ee801ae0e86e57' 
  AND token = '9CPaPycm+4U5Fcfm3rFrQdgQRWJD7JqopdxPE5jhOC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}