Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f00d16f0dc375f9bff7fbb51368aa029422d82603f2a5c410617c25119edc45' 
  AND token = 'gfr6siTqYAQsOaAhz0Pc1DfkcDbUgtMhr+GtTCEVGnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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