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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1880910874df168a76379a9e70c87271a977dc6a87b3e4095f13f1c62b6b052' 
  AND token = 'W7HkLCa3MNLvcd+UG4l1QaMz5jiMfe8Bu+zH0Q5GYI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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