Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99bdde548d2799ea6cebb0e8df8cd7f54260f622d18a5f645c192c752fdfaa1' 
  AND token = 'R2HvSevw6Du1YzKOs5DK7waYCrkr8mA6k9OqRXM++eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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