Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a1c77eb041ae3ffcd08f6c8c9c3960b73361615b69db5fdad208db990d0c75' 
  AND token = 'CUc/iMA39vS9owTguH55SFZOegiWwWDNIPMXb1U0Aso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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