Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad9fa53c2c0806a8c269bf7da5fbfd86239de1448dc3bca000e2ee0a5623e0' 
  AND token = 'dLkYqyIIW2VsfmS7CSgwJ2DN4SsuN28MCgCfPEtLsBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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