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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2406c3c7acf425c41eb135f2340b19a9131dd5355e93871b5395c0e975a8c20c' 
  AND token = '0q5rw1fANeTzInTkt6YZfzq2ds4FkGEntnXeInxQcls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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