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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8bf5a8b9194bc2f3969e3b9dfe6b7158c36fa6ea8f4d609f8a89efa57171e8e7' 
  AND token = 'PofNIr4s0+BpztK18/FLw/n5owgefOnvP84ejmvxnDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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