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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be182b7eef6a53016ebc709308ef469f5c8a816427391bed66a3279c2cfb3d24' 
  AND token = 'wpwxbLlcoBtqXK/jCWGfei7N4Up6CxoSWux8bXVpr3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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