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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47876107d32e43c1a9b0cd3f30fd663bf737021c51bd92e06c5aee4dfc5ec060' 
  AND token = '6FSOzIN6jl6DMDniItGIZhldI5CFCggjv/o1fDdgIyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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