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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '270bc30d56ea1c30d7585ec9c01186a9f56f1ebef69e829623ed69aa8ebc2bd6' 
  AND token = '02RY6qV7ico9+dzAZk8H6Zb+R81Weye4JdYbPJV+kH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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