Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e4f4e1ddb30e0b75913e08c34ddbc2ad3f4ebcab6d733532b9ffc8a7e940b2' 
  AND token = '+nnLNRIa8eTJnHsA4uo7VCAvr7ZaSPs93g8cPzqnTAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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