SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '88905c5def5883ebd28907964725a65d878134044a83ad6db0e921f7927523b7' 
  AND token = '0Ixj5NVx1nb2WtgrBDJmpLNV/UOxYzRH27YzZLQGKlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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