SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e680913494b7ad0cf4173b64622d2909fe596887269cc2a286fa0f21579e6a6' 
  AND token = 'yk2M1/3t3V/J1GBrWQy5WQZZii3dBmV+u7frSiyN3Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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