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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de4df3f1b86db7f3a007e9ccb46a82780d84abef9804c735bcd4d64ba0f501dc' 
  AND token = 'PYtA3yzCRUQSc4PcW4EyqauyNmAekm3de9O4fyQAtVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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