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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1cfaab63d3ef2ccef76a3213988a6837358a94a58c553e4755b8fe650af66b7' 
  AND token = 'ugSpIwdW57Mq4BHOnJe/yanYvws65KmS0BV4ujTNuFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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