SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e80082d2e7010c41dc9c9684fd08b57b52e96135072f8f47001e5d24422ff11' 
  AND token = 'w9Bi90yhCJUMDsqpJht7KBhUp8iRHHY/D8XtNI3z5Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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