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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '689229d16cb93b96e9b637faa3830b8a343df52d98b1827b86ea70f8673662bb' 
  AND token = 'fAElwxu8aCi6C6gFbcU5UtKrZoYl3H1u66n1D1+wIrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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