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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a68c4071512f3be6260a45ecd168787d6150dc88220ba8708dc8116f73a2b29' 
  AND token = 'pI0OO1SGfgCU1XzE9BGgMbPaeCvnQb3Sjog1HxgRCT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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