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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d82afa64cda234f44b79fad6a12b014230a2cf370cdee70321f8ac7e72d43d0' 
  AND token = 'QoDLCjYtAKxkhcKnc/MnRCltXwqadYS9CBB3S8jSx/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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