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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2fc85fdcefb24f301e7fdb9da3aaa7695d778a1bb930466215b2c529629a17a' 
  AND token = 'fHBeydIYfwt3vVdCjcYUpl7/DpftmZefsL/+soPrfQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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