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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd102b086feea3e1c9cba46f61c5151fb0e10844f15b68cb412fd16ba77f14195' 
  AND token = 'lPs4JTYC4dF4Mj7QnWQ4UnW2EV8H8FJCzFF2/imxlaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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