Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d26d5c63291fcd2ddc48f1622fc7f477b8b2a4e1ee57b14a3854a91c1bd587' 
  AND token = 'HyYQA5qzq3T2kpkOT4eLq2n2/w7wk1BddU/1rnIGJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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