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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '800468d604eb15612dee3d7a01c8689378c53df3365c207e36549635c11bf039' 
  AND token = 'jW/xTeRVNwzgkcVBniiXHcqy1kPu8979eySryq9YFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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