Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8063f7ee6a170793c9949cbe68e86cf4ad94fb74e6fe54068bed0adce50178a' 
  AND token = 'UsRs4RZWG+FJNk7gX7KSW+mtjES79lESS4GpfzwMBz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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