SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '593fa9610d38756c02b5cb6bf2476b9d4794d9db29ef118796871cf4fad7a6d0' 
  AND token = '6nOv3X99Hi/8vJocCQl2ziT2B7aKZkrDf7PuuJhHOgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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