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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd1c37c8d467bd6182241729b4950fcbc718b61c2a68bc90c72f7bdf44aa2833c' 
  AND token = 'AE6obEXANLPoKHbArnuJ/oRR5mwWRlKAcj2QeSg5rPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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