Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16378d0e0e0a10fc485f988886bd0a5ca6e71ee1d9d3bc8aab4311ca062bc866' 
  AND token = 'I1rtn6HfogdnFXPuORLJlHkfYTh74d1XRbNMK3KjNHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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