SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae0adaff485c9218e985a62c2b7ef318a63fd90541c53b40802987410b945a5e' 
  AND token = 'TAOflfEuziHKutESK3GFpEBXTVYm0yTzRsgsUn67Qms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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