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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe10e009a1e5c0ef71c0ae2b63f6dd91b9a8ae711bdf16dcadcf3437442250d7' 
  AND token = '4fZVzM6qOMCOJ8JEfH1BubZFIo6M5ht61ceycqcL4uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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