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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '247883b13fef99f6bc0f241b2a0bb04d767cff0602aeea80978b5e3c7421c3d4' 
  AND token = 'Ty2L5dsr5949KlFLIcfRKVtV0F112Amicdk5hVAdUDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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