Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4242aa0321dcadf6dc4279ca1429b0cc4df8638c9262f7e0cca92aafbd8b18fa' 
  AND token = 'nmM6y9hkNKFeKAT/RCgQyiTLdoeO4xUTCodW8a1+ASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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