Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b345136c9e8174c4bca2dc38a3008196cb1d504198d56b9d787b16977db4cda' 
  AND token = 'U8DbYC72+1EDeQIdZ9QDMICc86txc7d3VYSuS2V4dy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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