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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3054d821024511e11a8da30fbd4e5f330f3943b7bd15c004b2918dcd506a239d' 
  AND token = 'k58P+olLbZzxXXhdQeXjwM/DPk3nQ7dSG47V5/V6cSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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