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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '366558c191ddcc3f6fef7a946fd716d5ebc68369f8eb68973ab2f3b83dc2012b' 
  AND token = 'hqdKwiG1KHjbcktDkb9DA/1IAYLHWMXKa02MPA5KAVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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