Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc5a1b7352f15c7f1b0ddb7a74df16ad308e58eb1cf9f439340f06d6e16bb76' 
  AND token = 'jTXIhglMgJc7Ze/r8eoIx70vn2LpHF2XoiY+vplfrOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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