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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b87e3f2d3a58a4d7310c1c73198b3a39f5aa3a31f5d59383d47d6bcace6d6f63' 
  AND token = '+A9pQ28NbVO8KaJ37/JFfiDQXT0LvM6nlGjnSCmIa7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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