Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c7d3374d2db76ccca6ceed8c6fd8e663d60234556d3b0112fe90173d2a7da9' 
  AND token = 'Kk2iHaSjLNaO1H8yDhOHT70iOASAmlvOGhCvfQCYpYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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