Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f6508d9ebdc32a81415719d4fa63569efe5db86ce39f0e78f46dc04b21469c' 
  AND token = '5HHB2ZazJ6/UZc7grxLxii10iPmXx4QYvDQEh6Qzkd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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