Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bd38d4424a779161cc9360185356f568567ecf38ea97194052302927532a69' 
  AND token = 'FVXc6fTwqhCvu+8NEIyeae4/bVOFStqAD1dQtTMI2L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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