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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6627df13091e92b62deb77c1c56d25b52e557ae162089bc7b1f13791876b425' 
  AND token = 'IKyFJxss2bgQOsnHFqtAUGYOIAU9w1b3mM0MDc3ihHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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