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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7df942d6a9738f89df3153ac3334ee0a3227b4f11074be8be37f088db141aa77' 
  AND token = 'Zm7uhxYi1qLsbUyQrizX/fytn8BO1OPmHo8cdl6HXVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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