Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f88743bc1f9ab8f15a3736916dde792e2b0dc1e1021c4b74773ac151c1d2a2f' 
  AND token = 'UdtUfT9wDvLrYWc/oEaQjyteuZT6UTG5BC6MXq7l4aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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