Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644dd2e08adec2ef0a5dd0456d938cb12827ae38076fd106213d2680a76b65af' 
  AND token = 'OUoEzSLy+Sy7bAjrQNGug9mNXp8d2aQwjHkhjgVOcR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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