Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f397e0966deac594ea1470c57fe45cbabab32835cb058c4b285188fe7914049e' 
  AND token = '8k/MFvGLjEN2rCMPcpXc+u2+XhM5kYG927OioRCFqQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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