Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2c08eaa0f604425e4605d7836ff63dc972434860932bb0b838d5d00b40d6eaa' 
  AND token = '2dpLdpeCxAQc+dj42/SzxZBw00lR28430sj09NjfezE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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