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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9f0d068885cdd50811710d4c2e6bf9dcbc39d5bcb28512faf02f601be16c648' 
  AND token = 'EltqSe5pnH9dFiGXI3EJ6CelmWp2wpvhiC0Pjs9YN+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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