Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b4ea54883c4976f4be7caebfa168271083f956dc03321ab2347600dc5bccf9' 
  AND token = 'NzG9IAp4Hz0vkV8DODNHihVOF9VVrtl9fPXJOaLJ53A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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