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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60cfc1caf14041e015c4bc9c61a41f1b5ab7ebaa32cbbb12d23262fe8cb3fe56' 
  AND token = 'UyiFfSJZPR4ogl0u5EfyWDeateaBWaSor8V0jNPu8hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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