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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98752c4b87550643f4df1388a5c742f196b8bb67ea072fd46546736e7b5c9eeb' 
  AND token = 'nLQsCFUQC3Z8Bw2ETROms/hQdg/cTl8PO8tpfU/Znrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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