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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c6ee54c1034341bdaac57cbe9103a9c7e26afd89772286c9470753601c5125a' 
  AND token = 'epWstzsOhxjTgFaQdn8kNnsgX+KRtRmKy9gNXHdUWzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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