Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf1903fc7bc8cb760d51ef111a9ab9c4172e396585c4042cba9fd0b5a23b57a' 
  AND token = 'leTlv0hagt0sRJ+s6BC1P0hBfTjzXyg4AQLmZKk4cpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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