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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95bec63bda5ee889d3c93b5916db02fa6b41c142558704897891c6bb1b8a3e01' 
  AND token = 'HUMASdliuSHmNas5ZBgwrVv08FNGBNgZesAo7RbmuM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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