Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ba993939de73f298b51c6f5017dd4a63a98fcb35e05bb597b6275e36668863' 
  AND token = 'joT0dWX1+dP6VMxKVCxO3LnH6NUzm9mD1XqmeCenkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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