Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4678d252d086cb829780b6b3f33fbea378dfb0549bcb8082d8085ed3a4abf07' 
  AND token = 'I6U2Na4pQ33gWWabjv/+UZFbG17jbG825BWIMru0kVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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