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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1a7d27d82fa71f99b1afeabe5c8372f813c45e4252588d76e6bd3e99178bfa0' 
  AND token = 'y8fGNHlxeWaXEa+8rjhv/zt1eMTZog5l15/MvyQn1jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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