Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57dbe4c6e2cdb46c73721af8e3ca409720c194142290b57f17670f34697622d' 
  AND token = 'n057O260jWRjTGScZBVAxiCRmXg5TpeyhTCHqPD6uFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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