Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d0af2fc9107911559a790458f31261dadda760fdb17bc1c748f8b585eb5487' 
  AND token = 'KSjTxvF9/ISVc9XOOMHaI2dkJxnm1PGMuTY5fqm0stM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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