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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa86b52734c69d24c86fa522d5388312b541a1cb745e15f688778d74102294a1' 
  AND token = 'PvsGfUacPeT9XvZL1MgNagJsfRHXWdm+3QCaaARgW0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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