Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91d11bc379c8e1143620ec51fb1d91b88b106d94984ef7498df5bfecb2c2745' 
  AND token = 'cSmgoTnoPHFRpfUnLdfHadNIQuHZN7xJ7xjTeqZcELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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