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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa424854df4057c2466b02762b0affd9c7e4fe924008d452fcf381107e44fb3e' 
  AND token = '60Ng8yC9625F1Txy/GkCkxQzm8Ckf7RI8UOw7n4P/l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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